The Gilded Youth (1917)

Mary, the maid in a boardinghouse, falls in love with boarder John Slocum. Planning to marry, the couple jointly opens a savings account. In order to increase the account, John deprives himself of the barest necessities until he realizes that his scraggly appearance is making him the laughingstock of his office. After winning a lottery, John takes his winnings and invests them in fine clothes which allow him entry into exclusive restaurants where he eavesdrops on the brokers for stock tips. Meanwhile, Mary, suspicious of John's new raiment, believes that he is having an affair, but is pleasantly surprised when the tips pay off, making John a millionaire.